WO2019117287A1

WO2019117287A1 - Support and tire-rim assembly

Info

Publication number: WO2019117287A1
Application number: PCT/JP2018/046088
Authority: WO
Inventors: 大澤　靖雄; 幸恵吉原
Original assignee: 株式会社ブリヂストン
Priority date: 2017-12-14
Filing date: 2018-12-14
Publication date: 2019-06-20
Also published as: JP2019104458A

Abstract

This support is provided with: an elastic body that extends outward in a tire diameter direction from bead sections and that is offset from a tire side section as viewed from a direction aligned with a tire circumference direction, when the elastic body has been disposed spanning between the bead sections inside a pneumatic tire; and a fiber-reinforced layer joined to the elastic body.

Description

Support and tire / rim assembly

The present disclosure relates to a support and a tire / rim assembly.

Japanese Patent Application Laid-Open No. 2013-95369 discloses a side reinforced type run flat tire in which the tire side portion is reinforced with a side reinforcing rubber, and the durability during run flat running (that is, abnormal running with lowered air pressure) is secured. It is done.

In the run flat tire provided with the side reinforcing rubber as disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2013-95369, the deformation of the tire side portion during run flat running is suppressed, but the vertical spring during normal running becomes large Tend.

The present disclosure provides a support that enables run-flat travel when applied to a pneumatic tire, and a tire / rim assembly in which the vertical spring during normal travel is unlikely to become large and the vertical spring during normal travel is difficult to become large. .

The support according to the first aspect extends from the bead portion outward in the tire radial direction, as viewed from a direction along the tire circumferential direction, in a state where the support is disposed straddling the bead portion inside the pneumatic tire. The elastic body spaced apart from the part and the fiber reinforcement layer joined to the said elastic body are provided.

In the pneumatic tire in which the support according to the first aspect is disposed, the elastic body forming the support extends outward in the tire radial direction. Therefore, when the air pressure decreases, the support and the inner circumferential surface of the pneumatic tire come in contact with each other. At this time, the elastic body is pressed from the pneumatic tire. Since the fiber reinforced layer is joined to the elastic body, the elastic body is more rigid than the case where the fiber reinforced layer is not joined, and is less likely to be deformed by the pressure from the pneumatic tire. As a result, the pneumatic tire can run on a run flat.

Further, since the elastic body is disposed apart from the tire side portion, it is difficult to affect the rigidity of the tire side portion. For this reason, compared with the run flat tire provided with the side reinforcement rubber, the vertical spring at the time of normal running does not easily become large.

A support according to a second aspect is the support according to the first aspect, wherein the fiber reinforcing layer is formed on at least a part of a portion where a tensile stress is generated during runflat running of the pneumatic tire.

In the pneumatic tire in which the support according to the second aspect is disposed, during run-flat travel, the support is pressed radially inward from the pneumatic tire. At this time, compressive stress or tensile stress is partially generated inside the elastic body. Since the fiber reinforcing layer is disposed on at least a part of the portion where tensile stress is generated, deformation of the elastic body is suppressed as compared with, for example, the case where the fiber reinforcing layer is disposed only at the portion where compressive stress is generated.

The support according to the third aspect is the support according to the first or second aspect, wherein the elastic body is formed using an elastomer, and the fiber reinforcing layer is formed using an organic fiber.

In the support according to the third aspect, the elastic body is formed using an elastomer. For this reason, compared with the elastic body formed using metal etc., elasticity is low and lightweight. Therefore, when the elastic body comes in contact with the pneumatic tire, the inner peripheral surface of the pneumatic tire is less likely to be damaged. Moreover, since the fiber reinforcement layer is formed using organic fiber, it is lightweight compared with a steel wire etc.

The support according to the fourth aspect is the support according to any one of the first to third aspects, wherein the support is continuous across the bead portions of the elastic body as viewed in cross section along the width direction and the radial direction of the elastic body. At least a portion of the portion is formed of a single material.

In the support according to the fourth aspect, at least a portion of the continuous portion across the bead portion of the elastic body is formed of a single material, and therefore, the present invention is compared to the case where a plurality of materials are combined and formed. And easy to manufacture.

In the support according to the fifth aspect, in the support according to the first to fourth aspects, the inclination angle of the fibers forming the fiber reinforcing layer with respect to the tire radial direction is − when viewed from the direction along the tire axial direction 20 degrees or more and 20 degrees or less.

In the support according to the fifth aspect, the inclination angle of the fibers forming the fiber reinforced layer with respect to the tire radial direction is −20 ° or more and 20 ° or less when viewed from the axial direction of the tire. Compared with cases smaller than −20 ° and larger than 20 °, the resistance to the tensile force generated in the side portion of the support is high in the cross section along the tire width direction and the tire radial direction.

A support according to a sixth aspect is the support according to the first aspect to the fifth aspect, wherein the elastic body is provided with two protrusions projecting outward in the tire radial direction.

In the support according to the sixth aspect, the pneumatic tire can be supported at two places during run flat traveling. For this reason, compared with the case where it supports at one place, the load which acts on the inner skin of a pneumatic tire is distributed. Thereby, damage to the inner peripheral surface of the pneumatic tire can be suppressed.

A support according to a seventh aspect is the support according to the first aspect to the fifth aspect, wherein the elastic body is provided with three protrusions projecting outward in the tire radial direction.

In the support according to the seventh aspect, the pneumatic tire can be supported at three points during run-flat travel. For this reason, compared with the case where it supports at one place or two places, the load which acts on the inner skin of a pneumatic tire is distributed. Thereby, the load at the time of cornering can be supported with good balance.

The tire-rim assembly of the eighth aspect is formed by attaching the support of the first to seventh aspects and the pneumatic tire to a rim.

The tire-rim assembly according to the eighth aspect includes the support described in any one of the first to seventh aspects, and therefore can run-flat when the internal pressure decreases. In addition, since the support is disposed apart from the side portion, the vertical spring during normal traveling is less likely to be larger than the run flat tire provided with the side reinforcing rubber.

According to the present disclosure, there is provided a tire / rim assembly in which run-flat travel is possible when applied to a pneumatic tire, and a vertical spring during normal travel is unlikely to become large, and a vertical spring during normal travel is difficult to become large. Can be provided.

1 is a cross-sectional view showing a support according to a first embodiment of the present disclosure and a tire to which the support is applied. It is a perspective view showing a support concerning a 1st embodiment of this indication. 1 is a partial elevation view showing a support according to a first embodiment of the present disclosure and a tread-in side during run-flat travel of a tire to which the support is applied. FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the state at the time of run flat driving | running | working of the tire by which the support body which concerns on 1st Embodiment of this indication was applied. It is sectional drawing which shows the modification which applied the fiber reinforcement layer only to the part which the tensile stress of a support generate | occur | produces in the support body which concerns on 1st Embodiment of this indication. It is sectional drawing which shows the modification which applied the fiber reinforcement layer to the whole outer surface and inner surface of a support body in the support body which concerns on 1st Embodiment of this indication. FIG. 7 is a cross-sectional view showing a support according to a second embodiment of the present disclosure and a tire to which the support is applied. FIG. 7 is a cross-sectional view showing a support according to a second embodiment of the present disclosure and a tire to which the support is applied during run-flat travel. It is sectional drawing which shows the modification which applied the fiber reinforcement layer only to the part which the tensile stress of a support generate | occur | produces in the support body which concerns on 2nd Embodiment of this indication. It is sectional drawing which shows the modification which applied the fiber reinforcement layer to the whole outer surface and inner surface of a support body in the support body which concerns on 2nd Embodiment of this indication. It is sectional drawing which shows the modification which formed three protrusion parts which protrude in a tire radial direction in the support body which concerns on 2nd Embodiment of this indication. It is a table | surface which shows the performance test result of the tire to which the support body which concerns on 2nd Embodiment of this indication was applied, and the tire which concerns on a comparative example.

First Embodiment
FIG. 1 shows a pneumatic tire (hereinafter, referred to as “tire 10”) in which a support 40 and a support 40 according to a first embodiment of the present disclosure are disposed. In FIG. 1, a cut surface (in other words, a cross section seen from the direction along the tire circumferential direction) of the support 40 and the tire 10 along the tire width direction and the tire radial direction is shown. In the drawings, the arrow W indicates the width direction of the tire 10 (hereinafter referred to as the tire width direction), and the arrow R indicates the radial direction of the tire 10 (hereinafter referred to as the tire radial direction). The tire width direction referred to here indicates a direction parallel to the rotation axis of the tire 10. Further, the tire radial direction means a direction orthogonal to the rotation axis of the tire 10. Moreover, the code | symbol CL has shown the equatorial plane (it is hereafter called a tire equatorial plane) of the tire 10. As shown in FIG.

Further, in the present embodiment, the side closer to the rotation axis of the tire 10 along the tire radial direction is “inward in the tire radial direction”, and the side farther from the rotation axis of the tire 10 along the tire radial direction is “the outer side in the tire radial direction” And write. On the other hand, the side closer to the tire equatorial plane CL along the tire width direction will be referred to as "the inner side in the tire width direction", and the side farther from the tire equatorial plane CL along the tire width direction will be referred to as "the outer side in the tire width direction".

<Tire>
FIG. 1 shows a tire 10 assembled to a rim 30 which is a standard rim and filled with a standard air pressure. The term "standard rim" as used herein refers to the rim specified in the Year Book 2017 edition of JATMA (Japan Automobile Tire Association). Further, the standard air pressure is an air pressure corresponding to the maximum load capacity of JATMA (Japan Automobile Tires Association) Year Book 2017 edition. Assembly of the tire 10 to the rim 30 forms an example of the tire-rim assembly of the present disclosure.

As shown in FIG. 1, the tire 10 includes a pair of bead portions 12, a carcass 14 disposed across the bead cores 26 embedded in the bead portions 12, and a bead core 26 embedded in the bead portions 12 from the tire radial direction. A bead filler 28 extending outward along the outer surface of the carcass 14, a belt layer 16 provided on the tire radial direction outer side of the carcass 14, and a tread 20 provided on the tire radial direction outer side of the belt layer 16 There is.

A tread 20 that constitutes an outer peripheral portion of the tire 10 is provided on the tire radial direction outer side of the belt layer 16. The tire side portion 22 is configured by a sidewall lower portion 22A on the bead portion 12 side and a sidewall upper portion 22B on the tread 20 side, and connects the bead portion 12 and the tread 20.

(Bead part)
Bead cores 26 which are wire bundles are embedded in the pair of bead portions 12 respectively. A carcass 14 straddles these bead cores 26. The bead core 26 can adopt various structures in a pneumatic tire such as a circular cross section or a polygonal shape, and for example, a hexagonal can be adopted as a polygon, but in the present embodiment, it is a quadrangle. There is.

As shown in FIG. 1, in the region surrounded by the carcass 14 of the bead portion 12 (that is, the region outside the portion of the carcass 14 disposed inward in the tire width direction around the bead core 26), An outwardly extending bead filler 28 is embedded.

(Carcass)
The carcass (that is, carcass ply) 14 is a tire frame member formed by covering a plurality of cords with a covering rubber. The carcass 14 extends in a toroidal shape from one bead core 26 to the other bead core 26 to form a tire skeleton.

In the present embodiment, the carcass 14 is a radial carcass. The material of the carcass 14 is not particularly limited, and rayon, nylon, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), aramid, glass fiber, carbon fiber, steel or the like can be adopted. In terms of weight reduction, organic fiber cords are preferred. Further, although the number of implanted carcasses is in the range of 20 to 60/50 mm, it is not limited to this range.

(Belt layer)
A belt layer 16 is disposed on the tire radial direction outer side of the carcass 14. The belt layer 16 is composed of two belt plies 16A and 16B. The belt plies 16A and 16B are each formed by coating a plurality of cords (for example, organic fiber cords and metal cords) with a covering rubber. The cords constituting the belt plies 16A, 16B extend in the circumferential direction of the tire or in a direction inclined with respect to the circumferential direction.

(tread)
A tread 20 is provided on the outer side in the tire radial direction of the belt layer 16. The tread 20 is a portion that contacts the road surface during traveling, and a plurality of circumferential grooves 24 extending in the tire circumferential direction are formed on the radially outer side of the tread 20. The shape and the number of the circumferential grooves 24 are appropriately set in accordance with the performance required for the tire 10 such as drainage performance and steering stability.

<Support>
The support 40 is a tire support member formed in an annular shape as shown in FIG. The support body 40 is formed by arranging the elastic body 42 and the fiber reinforcing layer 44 in layers. The elastic body 42 is curved in a semicircular arc shape so as to be convex outward in the radial direction in a cross-sectional view along the width direction and the radial direction of the support body 40. The fiber reinforcing layer 44 is joined along the convex surface 42A of the elastic body 42. In the following description, the surface on the convex side of the support 40, the elastic body 42, and the fiber reinforcing layer 44 is referred to as the outer surface, and the surface on the concave side is referred to as the inner surface.

The elastic body 42 is a main body member of the support body 40, and is formed using an elastomer. The fiber reinforcing layer 44 is a cord layer formed by coating a plurality of organic fiber cords (for example, an aromatic polyamide cord) with the same elastomer as the elastic body 42. The elastomer constituting the fiber reinforcing layer 44 is bonded to the elastomer constituting the elastic body 42. Thus, the support 40 has a configuration in which the organic fiber cord is embedded in the inside of the elastomer. In the following description, the organic fiber cord is simply referred to as a cord 44A (see FIG. 3).

As shown in FIG. 1, in the state where the support body 40 is disposed inside the tire 10, the convex side surface 42A of the elastic body 42 and the fiber reinforcing layer 44 are disposed so as to face the outer side in the tire radial direction. That is, the elastic body 42 and the fiber reinforcing layer 44 are disposed so as to protrude outward in the tire radial direction. The support 40 extends outward in the tire radial direction and is disposed apart from the inner peripheral surface of the bead portion 12 and the inner peripheral surface 22 C of the tire side portion 22, and the support 40 and the tire side portion 22 are A space V is formed between the inner circumferential surface 22C.

Furthermore, the support body 40 is disposed across the bead portions 12 in a state of being precompressed in the tire width direction (that is, a state in which both end portions 40A of the support body 40 are deformed in a direction approaching each other). Thus, the support 40 is fixed in such a manner that the both end portions 40A press the inside of the bead portion 12. Further, the support 40 is disposed in contact with the rim 30.

FIG. 3 shows a partially enlarged view of the tread side of the tire 10 during runflat running. Also, in FIG. 3, the cord 44A embedded in the elastomer in the fiber reinforcing layer 44 is shown by a dotted line. The cords 44A are formed to intersect with the radial direction of the tire 10 and the support 40 at an angle θ. The angle θ is set to −20 ° ≦ θ ≦ 20 ° with a positive value when the cord 44A is inclined in the rotational direction shown by the arrow r in FIG. 3 when viewed from the inside in the radial direction. For example, θ in FIG. 3 is about −10 °.

In addition, at least one through hole (not shown) passing through the elastic body 42 and the fiber reinforcing layer 44 is provided as an air hole in the central portion in the tire width direction of the support body 40 in the tire circumferential direction.

<Function>
In the tire 10 to which the support 40 according to one embodiment is applied, as shown in FIG. 4, when the air pressure decreases, the outer peripheral surface of the support 40 contacts the inner peripheral surface of the tire 10. At this time, the support 40 is pressed inward in the tire radial direction from the tire 10.

Since the fiber reinforcing layer 44 is formed on the elastic body 42 constituting the support body 40, the support body 40 is against the pressing force from the tire 10 as compared with the case where the fiber reinforcing layer 44 is not formed. Hard to deform. As a result, the pneumatic tire can run on a run flat.

In addition, compressive stress and tensile stress are generated inside the support body 40 by the elastic body 42 being deformed. Specifically, a compressive stress is generated at a place where the elastic body 42 is deformed in a direction in which the elastic body 42 receives an external force, and a tensile stress is generated at a place where the elastic body 42 is deformed in the extending direction.

For example, as shown in FIG. 4, when the support 40 receives an external force P1 in a direction along the tire radial direction from the tire 10, a tensile stress TB is generated on the side portion 40B of the outer surface of the support 40. In addition, a tensile stress TC is also generated in the central portion 40C of the inner side surface of the support 40.

In the support body 40 according to the present embodiment, the fiber reinforcing layer 44 is joined along the convex surface 42 </ b> A of the elastic body 42. That is, the fiber reinforcing layer 44 is disposed along the outer surface of the support 40. As a result, the cords 44A (see FIG. 3) embedded in the fiber reinforcing layer 44 can resist the tensile stress TB.

Since the cord 44A resists the tensile stress TB, deformation of the support 40 is suppressed, so the support 40 resists the external force P1 and the tire 10 can run flat.

In addition, the elastic body 42 is formed using an elastomer. For this reason, compared with the case where a support body is formed using metal etc., it is hard to damage the inner peripheral surface of the tire 10, and is lightweight. Furthermore, when the fiber reinforcing layer 44 is formed using an organic fiber cord (code 44A), it is lightweight compared to using a steel wire or the like.

Further, since the elastic body 42 is formed at least in part from a single material (elastomer in this embodiment) in the direction extending from one bead to the opposite bead when viewed in width and radial cross section The manufacturing is easy as compared with the case of combining and forming a plurality of materials.

Further, when viewed in cross section along the width direction and the radial direction of the elastic body 42, the elastic body 42 is formed of a single material (elastomer in the present embodiment). For this reason, manufacture is easy compared with the case where it combines and forms a several material.

The elastic body may not necessarily be formed of a single material. For example, viewed in cross section along the width and radial directions of the elastic body, at least a part of a continuous portion (that is, a portion extending from one bead to the opposite bead) across the bead portions of the elastic body is a single It should just be formed with the material of.

Further, as shown in FIG. 1, since the elastic body 42 is disposed apart from the inner circumferential surface 22 C of the tire side portion 22, the rigidity of the tire side portion 22 is hardly affected. For this reason, compared with the run flat tire provided with the side reinforcement rubber, the vertical spring at the time of normal running does not easily become large.

Further, as shown in FIG. 3, the cords 44 </ b> A forming the fiber reinforcing layer 44 are inclined with respect to the tire radial direction and the radial direction of the support 40. For this reason, at the time of run flat running, it is possible to resist the tensile force TD acting along the tire circumferential direction on the tread-in side and the kick-out side. The durability of the support 40 is thereby enhanced.

Further, the inclination angle of the cord 44A with respect to the tire radial direction is set to −20 ° or more and 20 ° or less. For this reason, compared with the case where it is smaller than −20 ° or larger than 20 °, the resistance to the tensile stress TB (see FIG. 4) generated in the side portion 40B of the support 40 is high.

Further, the support 40 is disposed across the bead portions 12 in a state of being pre-compressed in the tire width direction. In addition, since it is held so as to be pressed against the bead portion 12, it is difficult to rattle during internal pressure travel (that is, during normal travel).

In the present embodiment, the fiber reinforcing layer 44 is formed on the outer surface of the elastic body 42 between the end portions 40A of the support 40, but the embodiment of the present disclosure is not limited thereto. For example, as in a fiber reinforcing layer 46 (

fiber reinforcing layers

46A and 46B) shown in FIG. 5A, only the side portion 40B of the outer surface of the support 40 and the central portion 40C of the inner surface may be covered. By arranging in this manner, the tensile stress TB generated in the side portion 40B and the tensile stress TC generated in the central portion 40C can be efficiently processed.

Alternatively, as shown in FIG. 5B, the elastic layer 42 is formed on the outer surface of the elastic body 42 so as to extend between the end portions 40A of the support 40, as in the fiber reinforcement layer 48 (

fiber reinforcement layers

48A and 48B). Alternatively, it may be formed across the end 40A of the support 40. By forming the fiber reinforcing layer in this manner, it is possible to exert a resistance to external forces acting from various directions.

Furthermore, although these

fiber reinforcing layers

44, 46, 48 are disposed exposed on the surface of the elastic body 42, the embodiment of the present disclosure is not limited thereto. For example, the surface of the

fiber reinforcing layers

44, 46, 48 opposite to the elastic body 42 may be coated with a protective layer. By providing the protective layer, the durability of the

fiber reinforcing layers

44, 46, 48 can be improved. In addition, as a material which forms a protective layer, the same material as the elastic body 42, etc. can be selected suitably. Moreover, about the structure which provides this protective layer, it is applicable also to

fiber reinforcement layer

54, 56, 58, 60 mentioned later.

Furthermore, the inclination angle of the cord 44A with respect to the tire radial direction may be smaller than −20 ° or larger than 20 °, as necessary. In this case, it is possible to easily resist the tensile force TD acting along the tire circumferential direction.

Second Embodiment
<Support>
As shown in FIGS. 2 and 1, the support body 40 in the first embodiment is formed to be curved in a semicircular arc shape so as to be convex radially outward. On the other hand, in the support 50 in the second embodiment, as shown in FIG. 6, two protrusions (protrusions 50U) protruding radially outward are formed. A radially inward recessed recess 50D is formed between the two protrusions 50U.

The protruding portion 50U of the support 50 is formed by a protruding portion 52U in which the elastic body 52 protrudes radially outward. Similarly, the recess 50D of the support 50 is formed by a recess 52D in which the elastic body 52 is depressed radially inward.

The fiber reinforcing layer 54 in the support 50 is joined along the outer surface of the elastic body 52 from each of the end portions 50A of the support 50 to the projecting portion 50U and the recess 50D.

About the other structure of the support body 50, it is the same as that of the support body 40 of 1st Embodiment, and abbreviate | omits description. In addition, the support 50 is applied to the same tire 10 as the support 40.

<Function>
In the tire 10 to which the support 50 in the second embodiment is applied, as shown in FIG. 7, when the air pressure decreases, the outer peripheral surface of the protrusion 50U of the support 50 contacts the inner peripheral surface of the tire 10 . At this time, since the tire 10 is supported by the two protrusions 50U, the load acting on the inner circumferential surface is dispersed as compared with the case where the tire 10 is supported by one protrusion. Damage to the inner circumferential surface of the tire 10 is thereby suppressed.

When the support 50 receives an external force P2 in a direction along the tire radial direction from the tire 10, a tensile stress TB is generated on the side portion 50B of the outer surface of the support 50 (projecting portion 50U). In addition, a tensile stress TC is also generated in the central portion 50C of the inner side surface of the support 50 (recess 50D).

In the support 50 according to the present embodiment, the fiber reinforcing layer 54 is joined along the outer surface of the elastic body 52. Thereby, a cord (not shown) embedded in the fiber reinforcing layer 54 can resist the tensile stress TB.

In the present embodiment, the fiber reinforcing layer 54 is joined along the outer side surface of the elastic body 52 from each of the end portions 50A of the support 50 to the projecting portion 50U. In other words, although the fiber reinforced layer is formed in part of the portion of the support 50 where tensile stress occurs, the embodiment of the present disclosure is not limited thereto.

For example, as shown in FIG. 8A, in addition to the fiber reinforcing layer 54, a fiber reinforcing layer 56 may be provided which is joined along the inner side surface of the elastic body 52 in the recess 50D of the support 50. By providing the fiber reinforcing layer 56, the support 50 can resist the tensile stress TC generated in the central portion 50C of the inner surface of the recess 50D. That is, it can resist all of the main tensile stresses generated in the support 50.

As described above, in the present disclosure, the fiber reinforcing layer may be formed on at least a part of the portion of the support 50 where tensile stress is generated, but it is implemented in various modes in consideration of rim assembly property and run flat durability. It can. For example, as shown in FIG. 6, if the fiber reinforcing layer is not provided in the recess 50D of the support 50, the recess 50D is easily elastically deformed, so that the rim assembling property can be enhanced, and as shown in FIG. If the fiber reinforcing layer 56 is provided at 50D, run-flat durability can be enhanced.

Alternatively, it may be formed on the outer surface and the inner surface of the elastic body 52, as shown in FIG. 8B (fiber reinforced

layers

58A, 58B), across the end 50A of the support 50. By forming the fiber reinforcing layer in this manner, it is possible to exert a resistance to external forces acting from various directions.

Further, in the support 50 in the present embodiment, two protrusions (protrusions 50U) protruding outward in the tire radial direction are formed, but the embodiment of the present disclosure is not limited thereto. For example, as in a support 60 shown in FIG. 9, three protrusions 60U may be formed. The protrusion 60U is formed by a protrusion 62U in which the elastic body 62 protrudes radially outward. Further, the protruding portion 60U is provided at a position corresponding to the central portion and the shoulder portion of the tread 20.

The load acting on the inner peripheral surface of the tire 10 is dispersed by forming three projecting portions 60U. Damage to the inner circumferential surface of the tire 10 is thereby suppressed. Further, since the load can be supported by the shoulder portion and the center portion of the tread 20, the load at the time of cornering of the tire 10 can be supported in a well-balanced manner. For this reason, damage to the tire 10 is suppressed.

Moreover, in FIG. 9, although the fiber reinforcement layer 64 is formed in the outer surface of the elastic body 62 over the both ends 60A of the support body 60, embodiment of this indication is not restricted to this. The fiber-reinforcing layer can be disposed at a necessary position as appropriate in the same manner as the

supports

40, 50.

[performance test]
In order to confirm the performance of the tire 10 to which the support 50 in the above embodiment is applied and the tire 10 to which the support 60 is applied, comparison is made with the pneumatic tires of Examples 1 and 2 below and not included in the present disclosure The run flat tires of Examples 1 and 2 were prepared and tested.

Example 1 is the tire 10 to which the support 50 is applied, and Example 2 is the tire 10 to which the support 60 is applied. Further, Comparative Example 1 is a run flat tire reinforced by bonding side reinforcing rubber to the inner peripheral surface 22C of the tire side portion 22 without using any of the

supports

40, 50, 60 in the above embodiment. Comparative Example 2 is a run in which both ends of a curved metal plate are formed of rubber without using any of the

supports

40, 50, and 60 in the above embodiment, and the rubber is disposed inside the bead portion 12. It is a flat tire.

The tire 10 of Example 1 and 2 and the tire of Comparative Example 2 used 205 / 55R1691V, and as the run flat tire in Comparative Example 1, the tire of tire size 205 / 55RF16 91V was used. In the test, a tire wheel with an air pressure of 0 kPa was placed on a steel drum tester with a diameter of 2 m, and a load of 3.92 kN was applied, a drum endurance test according to ISO 1692 was performed at a traveling speed of 80 km / h It went by considerable. Further, a separate test was conducted to measure the vertical spring property at the time of filling the internal pressure.

As shown in FIG. 6, it was found that the tire 10 of Examples 1 and 2 had a long drum travel distance as compared with Comparative Example 2. Moreover, it was found that the tire 10 of Examples 1 and 2 can reduce the longitudinal spring as compared with Comparative Example 1.

[Modification]
In the first embodiment, an elastomer is used for the elastic body 42 and the fiber reinforcing layer 44, but the embodiment of the present disclosure is not limited thereto. For example, in addition to general purpose resins such as thermoplastic resin, thermosetting resin, and (meth) acrylic resin, EVA resin, vinyl chloride resin, fluorine resin, silicone resin, engineering plastics (including super engineering plastics) and additives A vulcanized rubber or the like can be used. The same applies to the

elastic bodies

52 and 62 and the

fiber reinforcing layers

54 and 64 in the second embodiment.

A thermoplastic resin (including a thermoplastic elastomer) refers to a polymer compound which softens and flows as the temperature rises and becomes relatively hard and strong when cooled. In the present specification, among these, the material softens and flows as temperature rises, and becomes relatively hard and strong when cooled, and the polymer compound having rubbery elasticity is a thermoplastic elastomer, and the material increases as temperature rises. When the polymer compound softens, flows, cools, it becomes a relatively hard and strong state, and a polymer compound having no rubbery elasticity is distinguished as a non-elastomeric thermoplastic resin.

Examples of thermoplastic resins (including thermoplastic elastomers) include polyolefin thermoplastic elastomer (TPO), polystyrene thermoplastic elastomer (TPS), polyamide thermoplastic elastomer (TPA), polyurethane thermoplastic elastomer (TPU), polyester And thermoplastic thermoplastic elastomers (TPV) and thermoplastic olefin resins, polystyrene thermoplastic resins, polyamide thermoplastic resins and polyester thermoplastic resins.

Moreover, although the organic fiber cord is used as a cord which forms

fiber reinforcement layer

44, 54, 64 in the above-mentioned embodiment, an embodiment of this indication is not limited to this. For example, inorganic fiber cords such as steel cords, glass fibers and carbon fibers may be used. This steel cord is based on steel and can contain various minor inclusions such as carbon, manganese, silicon, phosphorus, sulfur, copper, chromium and the like.

In addition, as the various cords, a monofilament cord or a cord in which a plurality of filaments are twisted can be used. Various designs can be adopted for the twist structure, and various cross-section structures, twist pitches, twist directions, and distances between adjacent filaments can be used. Furthermore, by adopting a cord in which filaments of different materials are twisted, the cross-sectional structure is not particularly limited, and various twist structures such as single twist, layer twist, and double twist can be taken.

Furthermore, the fiber reinforcing layer may be configured using FRP (fiber reinforced plastic) instead of the cord coated with resin or the like. As fibers applied to FRP, glass fibers, carbon fibers, boron fibers, aramid fibers and the like can be appropriately selected. Thus, the present disclosure can be implemented in various ways.

The disclosure of Japanese Patent Application No. 2017-239789, filed on Dec. 14, 2017, is incorporated herein by reference in its entirety. All documents, patent applications and technical standards described herein are as specific and individually as individual documents, patent applications and technical standards are incorporated by reference. Incorporated herein by reference.

Claims

An elastic body extending outward from the bead portion in the radial direction of the tire and separated from the tire side portion as viewed from a direction along the circumferential direction of the tire in a state of being disposed across the bead portions inside the pneumatic tire;
A fiber reinforced layer joined to the elastic body,
Support.
The support according to claim 1, wherein the fiber reinforcing layer is formed on at least a part of a portion where a tensile stress is generated during runflat running of the pneumatic tire.
The support according to claim 1 or 2, wherein the elastic body is formed using an elastomer, and the fiber reinforcing layer is formed using an organic fiber.
4. The elastic body according to claim 1, wherein at least a part of the continuous portion across the bead portions of the elastic body is formed of a single material in a cross section along the width direction and the radial direction of the elastic body. The support according to any one of the above.
The inclination angle with respect to the tire radial direction of the fiber which forms the said fiber reinforcement layer seeing from the direction along a tire axial direction is -20 degrees or more, 20 degrees or less, It is described in any one of Claims 1-4. Support.
The support according to any one of claims 1 to 5, wherein the elastic body is provided with two protrusions projecting outward in the tire radial direction.
The support according to any one of claims 1 to 5, wherein the elastic body is provided with three protrusions projecting outward in the tire radial direction.
A tire / rim assembly comprising the support according to any one of claims 1 to 7 and the pneumatic tire assembled to a rim.